Present and past unreal conditional relative clauses have a secondary tense of the indicative. The main clause has a secondary tense with ἄν (cp. cross2303).

οὔτε γὰρ ἂν αὐτοὶ ἐπεχειροῦμεν πρά_ττειν ἃ (= εἴ τινα) μὴ ἠπιστάμεθα κτλ. for (if that were so) neither should we ourselves be undertaking (as we are) to do what we did not understand, etc. P.Charm. 171e, οἱ παῖδες ὑ_μῶν, ὅσοι (= εἴ τινες) ἐνθάδε ἦσαν, ὑπὸ τούτων ἂν ὑ_βρίζοντο (if that were so) your children, as many of them as were present (but none were present), would be insulted by these menL. 12.98, ὁπότερα τούτων ἐποίησεν, οὐδενὸς ἂν ἧττον πλούσιοι ἦσανwhichever of these things he had done, they would be no less rich than any one 32. 23.